On 15.5.2013 17:19, Viktor Dukhovni wrote:
It is a fallacy to claim that increasing the output capacity of a queue does not reduce congestion. Any queue is congested under high enough load, there might simply be too much mail slow or fast.
No one is saying that. Well, definitely I am not.
Your magical 60:1 model ignores the "supply" of deferred mail, it
What's magical about it?
is generally equal to the supply of new mail and should be tuned to generate retries at a rate below the output capacity. I'm providing that tuning.
Yes, you explain how you can achieve reasonable throughput by throwing in lots of delivery agents and by carefully tuning handful of secondary parameters so you get what you need. Well, at least as long as your input and output rates don't change much.
I instead provide additional knob which doesn't harm delivery of deferred mail in healthy mail system (such as mail deferred by greylisting) at all and is able to prevent congestion by undeliverable mail without doing either of those.
Still waiting to hear some reason why what I propose is bad. Patrik
